JPH03181736A - Air-conditioner - Google Patents

Abstract

PURPOSE:To maintain the condensing pressure within an adequate range without employing a complicate VRV system by a method wherein a damper is installed on the downstream side of an air outlet of an indoor heat exchanger so as to cover a half area of the air outlet, and opened and closed in connection with the rotation speed of an indoor fan and the operating number of compressors. CONSTITUTION:When signals from a VAV 12 are input to an air conditioner, a controller 14 decides an adequate air flow of an indoor fan 11 and outputs an instruction of the rotation speed to an inverter 15. At the same time, the controller 12 judges that a sufficient performance can be attained with one compressor 1 when the adequate air flow is less than 60% of the maximum air flow of the air conditioner, outputs an ON-instruction only to the No.1 compressor 1, stops the No.2 compressor 1 and closes a damper 9. As the damper 9 is closed, the air produced by the indoor fan 11 is sent merely to the No.1 compressor side of the indoor heat exchanger 6. Therefore, even when the air flow in a room is changed, the condensing pressure can be maintained within a proper range without employing a complicate VRV system.

Description

[Detailed description of the invention] Industrial applications The present invention relates to air volume control for an air conditioner.

2. Description of the Related Art A conventional air conditioner has a compressor 101 as shown in FIG.
．． Outdoor heat exchanger 102. Indoor heat exchanger 103 A pressure sensor 105 that senses the condensation pressure of a refrigerant circuit consisting of a button and a capillary tube 104, an inverter 106 that makes the rotation speed of the compressor 101 variable, and an outdoor heat exchanger 1
The air supply duct system 111 includes an indoor fan 10B that blows air into the room, an inverter 109 that makes the rotation speed of the indoor fan 108 variable, and an air supply duct system 111 that has a VAVllo.

If you press the button on the above configuration and the airflow amount of the indoor fan 108 is VAV
The pressure sensor 106 detects the change in condensing pressure due to the change in the amount of air passing through the indoor heat exchanger 103, and the compressor 101 The number of revolutions of an inverter 106 that makes the number of revolutions of the inverter variable is changed.

Problems to be Solved by the Invention However, in such a conventional configuration, VAVlo
According to the signal from l, the air volume from the indoor fan 108 is 6.
If the temperature falls below 0, the condensing pressure will decrease in cooling operation, and the condensing pressure will increase in heating operation. Therefore, in order to bring the condensing pressure within the appropriate range, the rotation speed of the compressor 101 is changed. Since it is necessary to configure a VRV system (variable refrigerant flow rate system) such as the inverter 106, which requires complicated control, the refrigerant circuit is also complicated and the number of parts increases, which increases costs.2. had.

The present invention has been made with the above-mentioned problems in mind and aims to provide an inexpensive and highly reliable air conditioner that is compatible with VAV.

Means for Solving the Problems To achieve this object, the present invention provides a refrigerant circuit consisting of a plurality of compressors, an outdoor heat exchanger, an indoor heat exchanger, and a capillary tube, and a cooling system that blows air to the outdoor heat exchanger. an outdoor fan that promotes heat exchange; an indoor fan that blows air to an indoor heat exchanger connected to a duct system with a VAV unit; an inverter that makes the rotation speed of this indoor fan variable; The rotation speed of the indoor fan is determined by the damper that limits the amount of air passing through the heat exchanger and the signal from the VAV.

The air conditioner consists of a control means that determines the number of operating compressors and whether to open or close dampers.

Function: With this configuration, the condensing pressure will be within the appropriate range by receiving the signal from the pVAV and opening and closing the indoor fan rotation speed, the number of operating compressors, and the damper of the indoor heat exchanger. .

EXAMPLE An example of the present invention will be described below with reference to the button in FIG. 1 and FIG. 2.

As shown in Fig. 1, a No. 1 compressor 1 and a No. 2 compressor 2 for compressing refrigerant, an outdoor heat exchanger 3 connected to the No. 1 compressor 1 and the No. 2 compressor 2, and 1 connected to heat exchanger 3
A refrigerant circuit is constituted by the capillary tube 4 for the No. 2 compressor and the indoor heat exchanger 6 connected to the capillary tube for the No. 2 compressor, and the indoor heat exchanger 6 is as shown in FIG. A circuit 7 for the No. 1 compressor 1 and a circuit 8 for the No. 2 compressor 2 are divided into two upper and lower circuits, and a damper 9 is installed on the leeward side of the circuit 8 for the No. 2 compressor 2.

On the other hand, an outdoor fan 10 that blows air to the outdoor heat exchanger 3 and an indoor fan 11 that blows air to the indoor heat exchanger 6 are each installed. An air supply duct 13 having a VAVl2 is connected to the discharge side of the indoor fan 11, and a control means 14 is controlled by a signal from the VAVl2, hB.
is the appropriate air volume of the indoor fan 11, No. 1 compressor 1, and No. 2 compressor 2 are ON.

0FFh and whether the damper 9 is open or closed, the indoor fan 1
Inverter 15 connected to No. 1 and No. 1 compressor 1, 2
No. compressor 2. Issue a command to damper 9.

The operation of the air conditioner configured as described above will be explained below. When the signal from VAVl 2 enters the air conditioner, the control means 14 determines the appropriate air volume for the indoor side 71 and 11, and at the same time issues a command to the inverter 16 to determine the rotation speed, and at the same time, If the appropriate air volume is 60% or less, it is determined that one compressor can provide sufficient capacity, and an ON command is issued to only No. 1 compressor 1.
The No. 1 compressor 2 is stopped and the damper 9 is closed. By closing the damper 9, the air from the indoor side 71 and 11 is sent to the indoor heat exchanger 6 only to the No. 1 compressor. As described above, according to the above configuration, even if the indoor air volume is changed, the condensing pressure can be kept within the appropriate range without using a complicated VRV system.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, a damper is installed in the leeward half of the indoor heat exchanger, and the opening and closing of the damper is controlled by the rotational speed of the indoor fan and the compressor. By linking to the number of units in operation, the condensing pressure can be kept within the appropriate range without using a complicated VRV system, and it is possible to provide an inexpensive and highly reliable VAV compatible air conditioner. It has this effect.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of the refrigerant circuit of an air conditioner according to an embodiment of the present invention, Fig. 2 is a refrigerant circuit diagram of the indoor heat exchanger, and Fig. 3 is a refrigerant circuit configuration diagram of a conventional air conditioner. It is. 1.2...Compressor, 3...Outdoor heat exchanger, 4゜5...Capillary tube, 6...
・Indoor heat exchanger, 9... Damper, 10...
...Outdoor fan, 11 Indoor fan, 12...
...VAV, 13...Duct system, 14...
...Control means, 15...Inverter.

Claims (1)

[Claims] A refrigerant circuit consisting of multiple compressors, an outdoor heat exchanger, an indoor heat exchanger, and a capillary tube, an outdoor fan that blows air to the outdoor heat exchanger to promote heat exchange, and a VAV.
An indoor fan that blows air to an indoor heat exchanger connected to a duct system having a unit, an inverter that makes the rotation speed of the indoor fan variable, a damper that limits the amount of air passing through the indoor heat exchanger, and An air conditioner comprising a control means that determines the rotational speed of the indoor fan, the number of operating compressors, and opening/closing of a damper based on a signal from a VAV.